Fuel-pump for explosion-engines.



F. MURPHY. FUEL PUMP FOR EXPLOSION ENGINES.

APPLICATION EILED MAY 27,1910.

Patented Apr. 11', 1911.

5 vwe W106 3313 attov nmgs I UNITED STATES PTENT OFFICE.

GEORGE F. MURPHY, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR T0 FUEL OIL ENGINE COMPANY, A CORPORATION OF RHODE ISLAND.

FUEL-PUMP FOR EXPLOSION-EN GIN ES.

Specification of Letters Patent.

Patented Apr. 11, 1911.

Application filed May 27, 1910. Serial No. 563,692.

Pumps for Explosion ngines, of which the following'is a full, clear, and exact descripmotion to the shaft corresponding to that of tion.

This invention relates to pumpingapparatus for injectin liquid fuel into the cylinders of interna combustion engines, the object being to provide a simple and reliable construction of pump capable of delivering to the engine accurately measured quantities of the liquid fuel, which quantity can be automaticallyor manually controlled.

The apparatus I have designed is of double or duplicate nature adapted particularly for delivering the fuel to the respective ends of a double acting engine cylinder.

In the accompanying drawing in which my improved pumping a paratus is illustrated': Figure 1 is a side e evation, partially in section, of the complete, pumping a paratus; and Fig. 2 is an end'elevation o the same.

On the left hand side of Fig. 1 one of the pumps is shown in side elevation, while the one on the other side, which is of the same construction, is shown in longitudinal section. The two pumps are supported by a central frame 1 whichcarries a bearing 2 for the operating lever 3 which is common to both pumps. This lever has a slotted connection at 4 with a crosshead 5 located at the middle of a piston rod 6, which rod extends in opposite directions and is common to both pumps. The pump cylinder is indicated by 7 through the head of which rod 6 passes, the ends of the rod serving as the piston. In the opposite end of the cylinder is a central valve seat for a valve 8 which is carried on the end of a push rod or valve stem 9. Immediately behind thevalve an annular chamber 10 is formed in the head of the cylinder which communicates freely with asource of oil or other liquid fuel (not shown) through a pipe 11. In the side of the pump cylinder is an .outlet port 12 which leads through the pipe 13 to the cylinder of the engine. This passage is controlled by check valves,'as

shown, preventing" backward flow. The valve stem 9 leads outward throu h the head of the cylinder and is provide at its extremity with an anti-friction ball 14 and is surrounded by a spring 15 which resists the inward movement of the stem.

The crosshead 5 is provided with an extending yoke 16 which embraces the middle portion of a shaft'17 and stands between two collars 18 fixed to the shaft, this construction serving to impart a reciprocating the piston rod 6. This shaft 17 extends in opposite directions through suitable bearings 19 under eachpump cylinder and at each extremity it carries an abutment preferably having the form of a cam disk20 hav- 111g an inclined lateral flange 21 at such a The operation 15 as follows: As the parts ,are shown in the drawing the stroke is about at the middle position, oil is being drawn into the cylinder 7 through the pipe 11 and. open valve 8. At the completlon of this stroke the c linder is full of-oil and the valve 8 is sti 1 open bein held in that 'position by the cam 20 whicdi rests against the rear end of the valve stem, the sprlng 15 being under compression. On the return stroke the piston moves inward and the cam is moved in the some direction. So long as the valve 8 remains o ened the oil inthe cylinder is forced -Joac' through the '0 en valve and pipe 11 to the tank, but the va ve is gradually closing due to the recession of the cam. Finally, the valve 8 closes at some-' time before the piston has completed its stroke, de ending upon the circumferential position of the flange 21' of the cam. When the valve thuscloses the oil that is displaced from the cylinder by the further inward movement of the piston is caused to flow through the port 12 and assage 13 to the cylinder of the engine. T is amount of 011 is the effective capacity of the pump and it is accurately measured by the rotary or circumferential position of the cam 20. The com is under the control of the governor 22 and is therefore automatically positioned in accordance with the requirements of the engine. On the suction stroke of the engine valve 8 remains closed under the tension of spring 15 until the flange of the cam' strikes the end of the valve stem, the piston meantime creating a vacuum in the cylinder which is immediately filled upon the opening of the valve.

It will be seen that the particular construction of cam provided is Susceptible of 4 wide and ready adjustment for either hand or automatic'operation, and that the quantity of oil delivered at each stroke of the pump can be regulated or measured very accurately. The device is adjustable by hand, since the crank 24 can readily be manipulated even while the engine is runsaid cam being rotatable by said cam shaft and being, on reciprocation of said cam shaft, thereby engageable by said valve stem at different points on its'cam' surface.

2. A fuel pumping apparatus for internal combustion, engines, comprising in combination, two pumps, a piston rod common to both pumps, a reciprocable shaft common to both pumps, a single lever adapted to reciprocate both the rod and shaft, a valve in each pump, and an abutment at each extremity of said shaft adapted to operate res pectively upon the valve stems of said valves, for the purpose setforth.

3. A fuel pumping apparatus for internal combustion engines, comprising in combination, two pumps, a piston rod common to both pumps, a reciprocable shaft common to both pumps, a lever adapted to reciprocate both the rod and shaft, a valve for each Y pump, and abutments carried by said shaft adapted to operate said valves, for the purpose set forth.

4:. In a fuel pumping apparatus for internal combustion engines, the combination of a cylinder, a piston rod entering one end of the cylinder, a valve stem enteringsaid cylinder, a reciprocable and rotatable shaft operatively connected to said piston rod, a cam shaped abutment mounted on said'shaft and adapted to actuate said valve stem {said being, on reciproc'fiition of said shaft, thereby engageable by a partof said valve stem at different points on its cam surface.

In witness whereof, I subscribe my signature, in the presence of two witnesses.

GEORGE F. MURPHY.

Witnesses:

BIoHAnD B. CoMsrooK, EMILY NORTH MURPHY.

abutment being rotatable'by said shaft and Copies of this patent may be obtaind for five cents each, by addressing the Commissioner of Patents, i

o Wa' hington, n. c." 

